Render an SVG chart from EPW data. Eight chart types: diurnal (~10 KB, monthly hourly profile), temp_carpet (heatmap of hour × day-of-year — ~30 KB preview / ~150 KB full), wind_rose (~12 KB, polar bars by direction × speed), monthly_boxplot (~6 KB, Q1/median/Q3 + whiskers per month), utci_carpet...
Risk signalsAccepts URL/endpoint input (url) · High parameter count (26 properties)
Part of the Epwforge Mcp server.
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AI agents use chart_weather to create or modify resources in Epwforge Mcp. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call chart_weather repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Epwforge Mcp.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"chart_weather": {
"limits": [
{
"counter": "chart_weather_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Epwforge Mcp policy for all 5 tools.
These attack patterns abuse exactly the kind of access chart_weather gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Render an SVG chart from EPW data. Eight chart types: diurnal (~10 KB, monthly hourly profile), temp_carpet (heatmap of hour × day-of-year — ~30 KB preview / ~150 KB full), wind_rose (~12 KB, polar bars by direction × speed), monthly_boxplot (~6 KB, Q1/median/Q3 + whiskers per month), utci_carpet (~90 KB, outdoor heat-stress hour × day, colored by UTCI category — Bröde 2012, shaded Tmrt), economizer_carpet (~90 KB, air-side economizer free / integrated / locked-out hour × day under ASHRAE 90.1 high-limit), pv_tilt_azimuth (~60 KB, annual PV generation across full tilt × azimuth space, isotropic-sky POA at lat from EPW header — optimum orientation marked), solar_under_events (~12 KB, weekly GHI of the modified scenario vs the no-overlay reference; bands color event-affected weeks. Requires config — server runs the pipeline twice, with and without overlays), comparison (~10 KB, design-condition deltas across EPWs). Accepts url (single), urls (2+ for comparison), or config (synthesize on the fly). Config mode is anon-safe — runs pipeline, returns SVG only. No auth required. Token budget: SVGs are returned inline by default. Large outputs (>50 KB) auto-upload to Blob storage (when configured) and return a URL instead, keeping your context lean. Always check svg_size_kb in the response. Presentation: when handing the chart to the user, just link or embed it — don't narrate what's in it. Let the chart speak.. It is categorised as a Write tool in the Epwforge Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Epwforge MCP server in PolicyLayer and add a rule for chart_weather: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Epwforge Mcp. Nothing to install.
chart_weather is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the chart_weather rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for chart_weather. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
chart_weather is provided by the Epwforge MCP server (pypi:epwforge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 Epwforge Mcp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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